摘要
针对在频率不断变换的情况下对信号功率进行测量的问题,提出了一种可同时测量信号瞬时频率、基波有功功率和视在功率的算法。输入信号为已经滤除了直流和高次谐波的基波分量,通过自适应有限长单位冲击响应(FIR)数字滤波器测量了基波有功功率,通过Prony算法测量了信号的瞬时频率和视在功率,利用改进的最小加权二乘法(WLS)算法提高了功率的精确度。研究结果表明,在频率大量变化的情况下,该算法对信号频率、有功功率以及视在功率的测量的精确度可满足工程应用的需要。
Aiming at the power measurement under wide-range frequency deviations,a simple algorithm for measurement of the frequency and both the fundamental active and apparent power of a power system was presented.The input voltage and current signals were filtered to be fundamental components and the noise effects were minimized,adaptive finite-impulse-response（FIR） filters were used to measure fundamental active power,Prony-based algorithm was carried out to measure the frequency and fundamental apparent power.Weighted-least-square（WLS）algorithm was employed to improve the precision of both the fundamental active and apparent power.The results indicate that the measurement with proposed algorithm has a high accuracy over a wide range of frequency changes.Thus,the proposed algorithm really meets the needs of online applications.
出处
《机电工程》
CAS
2012年第5期568-571,共4页
Journal of Mechanical & Electrical Engineering
关键词
自适应有限脉冲响应滤波器
视在功率
有功功率
基波
PRONY算法
最小加权二乘法
adaptive finite-impulse-response（FIR） filters
apparent power
active power
fundamental wave
Prony-based algorithm
weighted-least-square（WLS）
